Otto is so driven to become a school psychologist that he spends every night studying. this sentence describes the wants or needs that direct behavior toward a goal, also called

The behavior of Otto that made him feel or act that way was because of motivation. Motivation enables a person to be driven in a way that he or she has the will to do something because of a particular thing. The motivation that gave Otto to act the way he's acting now is because of the motivation of wanting to be a psychologist, that makes himself study every night.